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69 lines
2.3 KiB
69 lines
2.3 KiB
(function (exports) {
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'use strict';
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// RFC 6844
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// Explanation: https://tools.ietf.org/html/rfc6844#section-3
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// Binary Format: https://tools.ietf.org/html/rfc6844#section-5
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// Real-world Usage: https://support.dnsimple.com/articles/caa-record/
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// A Certification Authority Authorization (CAA) record is used to specify which
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// certificate authorities (CAs) are allowed to issue certificates for a domain.
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// Value Meaning/Use
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//
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// Flag An unsigned integer between 0-255.
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// It is currently used to represent the critical flag, that has a
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// specific meaning per RFC 6844
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// Tag An ASCII string that represents the identifier of the property
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// represented by the record.
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// Value The value associated with the tag.
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// The RFC currently defines 3 available tags:
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//
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// - issue: explicity authorizes a single certificate authority to issue a
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// certificate (any type) for the hostname.
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// - issuewild: explicity authorizes a single certificate authority to issue a
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// wildcard certificate (and only wildcard) for the hostname.
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// - iodef: specifies an URL to which a certificate authority may report
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// policy violations.
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exports.DNS_PACKER_TYPE_CAA = function (ab, dv, total, record) {
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if ('number' !== typeof record.flag || isNaN(record.flag) || record.flag < 0 || record.flag > 255) {
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console.log(record);
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throw new Error("bad CAA flag:", record.flag);
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}
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if ('string' !== typeof record.tag || !record.tag || record.tag.length > 255) {
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throw new Error("bad CAA tag:", record.tag);
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}
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if ('string' !== typeof record.value || !record.value) {
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throw new Error("bad CAA value:", record.value);
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}
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// RDLEN = flag (1 byte) + taglen (1 byte) + tagstr (taglen bytes) + valuestr (valuelen bytes)
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dv.setUint16(total, 1 + 1 + record.tag.length + record.value.length, false);
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total += 2;
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// FLAG
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dv.setUint8(total, record.flag, false);
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total += 1;
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// TAG LENGTH
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dv.setUint8(total, record.tag.length, false);
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total += 1;
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// TAG
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record.tag.split('').forEach(function (ch) {
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dv.setUint8(total, ch.charCodeAt(0), false);
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total += 1;
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});
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// VALUE
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record.value.split('').forEach(function (ch) {
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dv.setUint8(total, ch.charCodeAt(0), false);
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total += 1;
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});
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return total;
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};
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}('undefined' !== typeof window ? window : exports));
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